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96 XP WOT only 6350 RPM's

So I was out jumping some really big waves yesterday and the thing was running great! I went to ride today on smooth water and I noticed that the RPM's were in the 6300's and the free GPS app (Speed Box) was only showing 47 mph tops.

I recently rebuilt the carbs and have a newly rebuilt engine. It's not hesitating off the start and the engine seems to be running smoothly.

Re: 96 XP WOT only 6350 RPM's

Are the rave valves stuck? Also try riding with the seat off and look for water spraying from somewhere (water regulator on the waterbox and headpipe to exhaust mani gasket are common places)or exhaust smoke in the hull.

Re: 96 XP WOT only 6350 RPM's

They should not be stuck at 15 hrs even if you were running cheap oil and too much of it. To check push the wire retaining clip back off the black rave cap with your thumbs and be carful not to drop the spring underneath. Then you can grab the circle part(bellows over a rave piston) and slide in and out, or at least you should be able to.

Re: 96 XP WOT only 6350 RPM's

Originally Posted by JC-SuperJet

Smoke in the hull would mean an exhaust leak. Check and tighten all the exhaust joints and hoses. Exhaust leaks result in a drop in performance.

Ditto --- smoke in hull will cause significant running problems due to lack of combustion oxygen. A malfunctioning water regulator will also stop your ski at near that rpm. Most common problem is the ferrous(rusty) spring clip that is used to hold the bottom of the diaphragm to the valve pokes a hole in the diaphragm and it leaks through. Then it will not work correctly to adjust water flow for peak rpm.

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Re: 96 XP WOT only 6350 RPM's

Originally Posted by hafweigthr

A malfunctioning water regulator will also stop your ski at near that rpm. Most common problem is the ferrous(rusty) spring clip that is used to hold the bottom of the diaphragm to the valve pokes a hole in the diaphragm and it leaks through. Then it will not work correctly to adjust water flow for peak rpm.

I will have to find some pictures, but I used stainless steel safety wire to replace the carbon steel spring clip. I didn't tie the wire too tight, just enough to give good clamping pressure.

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Re: 96 XP WOT only 6350 RPM's

First off, thanks for y'alls help.

Here is what I saw when I road it just a minute ago. Is this the water regulator on top of the water box? Water was leaking out of the bottom of it. I didn't notice any smoke, although I didn't ride it long enough really to see.IMG_3743.jpg